<?php
/**
 * Smarty Internal Plugin Smarty Template  Base
 *
 * This file contains the basic shared methodes for template handling
 *
 * @package Smarty
 * @subpackage Template
 * @author Uwe Tews
 */

/**
 * Class with shared template methodes
 *
 * @package Smarty
 * @subpackage Template
 */
abstract class Smarty_Internal_TemplateBase extends Smarty_Internal_Data {

	/**
	 * fetches a rendered Smarty template
	 *
	 * @param string $template          the resource handle of the template file or template object
	 * @param mixed  $cache_id          cache id to be used with this template
	 * @param mixed  $compile_id        compile id to be used with this template
	 * @param object $parent            next higher level of Smarty variables
	 * @param bool   $display           true: display, false: fetch
	 * @param bool   $merge_tpl_vars    if true parent template variables merged in to local scope
	 * @param bool   $no_output_filter  if true do not run output filter
	 * @return string rendered template output
	 */
	public function fetch($template = null, $cache_id = null, $compile_id = null, $parent = null, $display = false, $merge_tpl_vars = true, $no_output_filter = false)
	{
		if ($template === null && $this instanceof $this->template_class) {
			$template = $this;
		}
		if (!empty($cache_id) && is_object($cache_id)) {
			$parent = $cache_id;
			$cache_id = null;
		}
		if ($parent === null && ($this instanceof Smarty || is_string($template))) {
			$parent = $this;
		}
		// create template object if necessary
		$_template = ($template instanceof $this->template_class)
		? $template
		: $this->smarty->createTemplate($template, $cache_id, $compile_id, $parent, false);
		// if called by Smarty object make sure we use current caching status
		if ($this instanceof Smarty) {
			$_template->caching = $this->caching;
		}
		// merge all variable scopes into template
		if ($merge_tpl_vars) {
			// save local variables
			$save_tpl_vars = $_template->tpl_vars;
			$save_config_vars = $_template->config_vars;
			$ptr_array = array($_template);
			$ptr = $_template;
			while (isset($ptr->parent)) {
				$ptr_array[] = $ptr = $ptr->parent;
			}
			$ptr_array = array_reverse($ptr_array);
			$parent_ptr = reset($ptr_array);
			$tpl_vars = $parent_ptr->tpl_vars;
			$config_vars = $parent_ptr->config_vars;
			while ($parent_ptr = next($ptr_array)) {
				if (!empty($parent_ptr->tpl_vars)) {
					$tpl_vars = array_merge($tpl_vars, $parent_ptr->tpl_vars);
				}
				if (!empty($parent_ptr->config_vars)) {
					$config_vars = array_merge($config_vars, $parent_ptr->config_vars);
				}
			}
			if (!empty(Smarty::$global_tpl_vars)) {
				$tpl_vars = array_merge(Smarty::$global_tpl_vars, $tpl_vars);
			}
			$_template->tpl_vars = $tpl_vars;
			$_template->config_vars = $config_vars;
		}
		// dummy local smarty variable
		if (!isset($_template->tpl_vars['smarty'])) {
			$_template->tpl_vars['smarty'] = new Smarty_Variable;
		}
		if (isset($this->smarty->error_reporting)) {
			$_smarty_old_error_level = error_reporting($this->smarty->error_reporting);
		}
		// check URL debugging control
		if (!$this->smarty->debugging && $this->smarty->debugging_ctrl == 'URL') {
			if (isset($_SERVER['QUERY_STRING'])) {
				$_query_string = $_SERVER['QUERY_STRING'];
			} else {
				$_query_string = '';
			}
			if (false !== strpos($_query_string, $this->smarty->smarty_debug_id)) {
				if (false !== strpos($_query_string, $this->smarty->smarty_debug_id . '=on')) {
					// enable debugging for this browser session
					setcookie('SMARTY_DEBUG', true);
					$this->smarty->debugging = true;
				} elseif (false !== strpos($_query_string, $this->smarty->smarty_debug_id . '=off')) {
					// disable debugging for this browser session
					setcookie('SMARTY_DEBUG', false);
					$this->smarty->debugging = false;
				} else {
					// enable debugging for this page
					$this->smarty->debugging = true;
				}
			} else {
				if (isset($_COOKIE['SMARTY_DEBUG'])) {
					$this->smarty->debugging = true;
				}
			}
		}
		// must reset merge template date
		$_template->smarty->merged_templates_func = array();
		// get rendered template
		// disable caching for evaluated code
		if ($_template->source->recompiled) {
			$_template->caching = false;
		}
		// checks if template exists
		if (!$_template->source->exists) {
			if ($_template->parent instanceof Smarty_Internal_Template) {
				$parent_resource = " in '{$_template->parent->template_resource}'";
			} else {
				$parent_resource = '';
			}
			throw new SmartyException("Unable to load template {$_template->source->type} '{$_template->source->name}'{$parent_resource}");
		}
		// read from cache or render
		if (!($_template->caching == Smarty::CACHING_LIFETIME_CURRENT || $_template->caching == Smarty::CACHING_LIFETIME_SAVED) || !$_template->cached->valid) {
			// render template (not loaded and not in cache)
			if (!$_template->source->uncompiled) {
				$_smarty_tpl = $_template;
				if ($_template->source->recompiled) {
					if ($this->smarty->debugging) {
						Smarty_Internal_Debug::start_compile($_template);
					}
					$code = $_template->compiler->compileTemplate($_template);
					if ($this->smarty->debugging) {
						Smarty_Internal_Debug::end_compile($_template);
					}
					if ($this->smarty->debugging) {
						Smarty_Internal_Debug::start_render($_template);
					}
					try {
						ob_start();
						eval("?>" . $code);
						unset($code);
					} catch (Exception $e) {
						ob_get_clean();
						throw $e;
					}
				} else {
					if (!$_template->compiled->exists || ($_template->smarty->force_compile && !$_template->compiled->isCompiled)) {
						$_template->compileTemplateSource();
					}
					if ($this->smarty->debugging) {
						Smarty_Internal_Debug::start_render($_template);
					}
					if (!$_template->compiled->loaded) {
						include($_template->compiled->filepath);
						if ($_template->mustCompile) {
							// recompile and load again
							$_template->compileTemplateSource();
							include($_template->compiled->filepath);
						}
						$_template->compiled->loaded = true;
					} else {
						$_template->decodeProperties($_template->compiled->_properties, false);
					}
					try {
						ob_start();
						if (empty($_template->properties['unifunc']) || !is_callable($_template->properties['unifunc'])) {
							throw new SmartyException("Invalid compiled template for '{$_template->template_resource}'");
						}
						array_unshift($_template->_capture_stack,array());
						//
						// render compiled template
						//
						$_template->properties['unifunc']($_template);
						// any unclosed {capture} tags ?
						if (isset($_template->_capture_stack[0][0])) {
							$_template->capture_error();
						}
						array_shift($_template->_capture_stack);
					} catch (Exception $e) {
						ob_get_clean();
						throw $e;
					}
				}
			} else {
				if ($_template->source->uncompiled) {
					if ($this->smarty->debugging) {
						Smarty_Internal_Debug::start_render($_template);
					}
					try {
						ob_start();
						$_template->source->renderUncompiled($_template);
					} catch (Exception $e) {
						ob_get_clean();
						throw $e;
					}
				} else {
					throw new SmartyException("Resource '$_template->source->type' must have 'renderUncompiled' method");
				}
			}
			$_output = ob_get_clean();
			if (!$_template->source->recompiled && empty($_template->properties['file_dependency'][$_template->source->uid])) {
				$_template->properties['file_dependency'][$_template->source->uid] = array($_template->source->filepath, $_template->source->timestamp, $_template->source->type);
			}
			if ($_template->parent instanceof Smarty_Internal_Template) {
				$_template->parent->properties['file_dependency'] = array_merge($_template->parent->properties['file_dependency'], $_template->properties['file_dependency']);
				foreach ($_template->required_plugins as $code => $tmp1) {
					foreach ($tmp1 as $name => $tmp) {
						foreach ($tmp as $type => $data) {
							$_template->parent->required_plugins[$code][$name][$type] = $data;
						}
					}
				}
			}
			if ($this->smarty->debugging) {
				Smarty_Internal_Debug::end_render($_template);
			}
			// write to cache when nessecary
			if (!$_template->source->recompiled && ($_template->caching == Smarty::CACHING_LIFETIME_SAVED || $_template->caching == Smarty::CACHING_LIFETIME_CURRENT)) {
				if ($this->smarty->debugging) {
					Smarty_Internal_Debug::start_cache($_template);
				}
				$_template->properties['has_nocache_code'] = false;
				// get text between non-cached items
				$cache_split = preg_split("!/\*%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*\/(.+?)/\*/%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*/!s", $_output);
				// get non-cached items
				preg_match_all("!/\*%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*\/(.+?)/\*/%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*/!s", $_output, $cache_parts);
				$output = '';
				// loop over items, stitch back together
				foreach ($cache_split as $curr_idx => $curr_split) {
					// escape PHP tags in template content
					$output .= preg_replace('/(<%|%>|<\?php|<\?|\?>)/', '<?php echo \'$1\'; ?>', $curr_split);
					if (isset($cache_parts[0][$curr_idx])) {
						$_template->properties['has_nocache_code'] = true;
						// remove nocache tags from cache output
						$output .= preg_replace("!/\*/?%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*/!", '', $cache_parts[0][$curr_idx]);
					}
				}
				if (!$no_output_filter && !$_template->has_nocache_code && (isset($this->smarty->autoload_filters['output']) || isset($this->smarty->registered_filters['output']))) {
					$output = Smarty_Internal_Filter_Handler::runFilter('output', $output, $_template);
				}
				// rendering (must be done before writing cache file because of {function} nocache handling)
				$_smarty_tpl = $_template;
				try {
					ob_start();
					eval("?>" . $output);
					$_output = ob_get_clean();
				} catch (Exception $e) {
					ob_get_clean();
					throw $e;
				}
				// write cache file content
				$_template->writeCachedContent($output);
				if ($this->smarty->debugging) {
					Smarty_Internal_Debug::end_cache($_template);
				}
			} else {
				// var_dump('renderTemplate', $_template->has_nocache_code, $_template->template_resource, $_template->properties['nocache_hash'], $_template->parent->properties['nocache_hash'], $_output);
				if (!empty($_template->properties['nocache_hash']) && !empty($_template->parent->properties['nocache_hash'])) {
					// replace nocache_hash
					$_output = str_replace("{$_template->properties['nocache_hash']}", $_template->parent->properties['nocache_hash'], $_output);
					$_template->parent->has_nocache_code = $_template->parent->has_nocache_code || $_template->has_nocache_code;
				}
			}
		} else {
			if ($this->smarty->debugging) {
				Smarty_Internal_Debug::start_cache($_template);
			}
			try {
				ob_start();
				array_unshift($_template->_capture_stack,array());
				//
				// render cached template
				//
				$_template->properties['unifunc']($_template);
				// any unclosed {capture} tags ?
				if (isset($_template->_capture_stack[0][0])) {
					$_template->capture_error();
				}
				array_shift($_template->_capture_stack);
				$_output = ob_get_clean();
			} catch (Exception $e) {
				ob_get_clean();
				throw $e;
			}
			if ($this->smarty->debugging) {
				Smarty_Internal_Debug::end_cache($_template);
			}
		}
		if ((!$this->caching || $_template->has_nocache_code || $_template->source->recompiled) && !$no_output_filter && (isset($this->smarty->autoload_filters['output']) || isset($this->smarty->registered_filters['output']))) {
			$_output = Smarty_Internal_Filter_Handler::runFilter('output', $_output, $_template);
		}
		if (isset($this->error_reporting)) {
			error_reporting($_smarty_old_error_level);
		}
		// display or fetch
		if ($display) {
			if ($this->caching && $this->cache_modified_check) {
				$_isCached = $_template->isCached() && !$_template->has_nocache_code;
				$_last_modified_date = @substr($_SERVER['HTTP_IF_MODIFIED_SINCE'], 0, strpos($_SERVER['HTTP_IF_MODIFIED_SINCE'], 'GMT') + 3);
				if ($_isCached && $_template->cached->timestamp <= strtotime($_last_modified_date)) {
					switch (PHP_SAPI) {
						case 'cgi':         // php-cgi < 5.3
						case 'cgi-fcgi':    // php-cgi >= 5.3
						case 'fpm-fcgi':    // php-fpm >= 5.3.3
							header('Status: 304 Not Modified');
							break;

						case 'cli':
							if (/* ^phpunit */!empty($_SERVER['SMARTY_PHPUNIT_DISABLE_HEADERS'])/* phpunit$ */) {
								$_SERVER['SMARTY_PHPUNIT_HEADERS'][] = '304 Not Modified';
							}
							break;

						default:
							header($_SERVER['SERVER_PROTOCOL'].' 304 Not Modified');
							break;
					}
				} else {
					switch (PHP_SAPI) {
						case 'cli':
							if (/* ^phpunit */!empty($_SERVER['SMARTY_PHPUNIT_DISABLE_HEADERS'])/* phpunit$ */) {
								$_SERVER['SMARTY_PHPUNIT_HEADERS'][] = 'Last-Modified: ' . gmdate('D, d M Y H:i:s', $_template->cached->timestamp) . ' GMT';
							}
							break;

						default:
							header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $_template->cached->timestamp) . ' GMT');
							break;
					}
					echo $_output;
				}
			} else {
				echo $_output;
			}
			// debug output
			if ($this->smarty->debugging) {
				Smarty_Internal_Debug::display_debug($this);
			}
			if ($merge_tpl_vars) {
				// restore local variables
				$_template->tpl_vars = $save_tpl_vars;
				$_template->config_vars =  $save_config_vars;
			}
			return;
		} else {
			if ($merge_tpl_vars) {
				// restore local variables
				$_template->tpl_vars = $save_tpl_vars;
				$_template->config_vars =  $save_config_vars;
			}
			// return fetched content
			return $_output;
		}
	}

	/**
	 * displays a Smarty template
	 *
	 * @param string $template   the resource handle of the template file or template object
	 * @param mixed  $cache_id   cache id to be used with this template
	 * @param mixed  $compile_id compile id to be used with this template
	 * @param object $parent     next higher level of Smarty variables
	 */
	public function display($template = null, $cache_id = null, $compile_id = null, $parent = null)
	{
		// display template
		$this->fetch($template, $cache_id, $compile_id, $parent, true);
	}

	/**
	 * test if cache is valid
	 *
	 * @param string|object $template   the resource handle of the template file or template object
	 * @param mixed         $cache_id   cache id to be used with this template
	 * @param mixed         $compile_id compile id to be used with this template
	 * @param object        $parent     next higher level of Smarty variables
	 * @return boolean cache status
	 */
	public function isCached($template = null, $cache_id = null, $compile_id = null, $parent = null)
	{
		if ($template === null && $this instanceof $this->template_class) {
			return $this->cached->valid;
		}
		if (!($template instanceof $this->template_class)) {
			if ($parent === null) {
				$parent = $this;
			}
			$template = $this->smarty->createTemplate($template, $cache_id, $compile_id, $parent, false);
		}
		// return cache status of template
		return $template->cached->valid;
	}

	/**
	 * creates a data object
	 *
	 * @param object $parent next higher level of Smarty variables
	 * @returns Smarty_Data data object
	 */
	public function createData($parent = null)
	{
		return new Smarty_Data($parent, $this);
	}

	/**
	 * Registers plugin to be used in templates
	 *
	 * @param string   $type       plugin type
	 * @param string   $tag        name of template tag
	 * @param callback $callback   PHP callback to register
	 * @param boolean  $cacheable  if true (default) this fuction is cachable
	 * @param array    $cache_attr caching attributes if any
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException when the plugin tag is invalid
	 */
	public function registerPlugin($type, $tag, $callback, $cacheable = true, $cache_attr = null)
	{
		if (isset($this->smarty->registered_plugins[$type][$tag])) {
			throw new SmartyException("Plugin tag \"{$tag}\" already registered");
		} elseif (!is_callable($callback)) {
			throw new SmartyException("Plugin \"{$tag}\" not callable");
		} else {
			$this->smarty->registered_plugins[$type][$tag] = array($callback, (bool) $cacheable, (array) $cache_attr);
		}

		return $this;
	}

	/**
	 * Unregister Plugin
	 *
	 * @param string $type of plugin
	 * @param string $tag name of plugin
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unregisterPlugin($type, $tag)
	{
		if (isset($this->smarty->registered_plugins[$type][$tag])) {
			unset($this->smarty->registered_plugins[$type][$tag]);
		}

		return $this;
	}

	/**
	 * Registers a resource to fetch a template
	 *
	 * @param string $type name of resource type
	 * @param Smarty_Resource|array $callback or instance of Smarty_Resource, or array of callbacks to handle resource (deprecated)
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function registerResource($type, $callback)
	{
		$this->smarty->registered_resources[$type] = $callback instanceof Smarty_Resource ? $callback : array($callback, false);
		return $this;
	}

	/**
	 * Unregisters a resource
	 *
	 * @param string $type name of resource type
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unregisterResource($type)
	{
		if (isset($this->smarty->registered_resources[$type])) {
			unset($this->smarty->registered_resources[$type]);
		}

		return $this;
	}

	/**
	 * Registers a cache resource to cache a template's output
	 *
	 * @param string               $type     name of cache resource type
	 * @param Smarty_CacheResource $callback instance of Smarty_CacheResource to handle output caching
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function registerCacheResource($type, Smarty_CacheResource $callback)
	{
		$this->smarty->registered_cache_resources[$type] = $callback;
		return $this;
	}

	/**
	 * Unregisters a cache resource
	 *
	 * @param string $type name of cache resource type
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unregisterCacheResource($type)
	{
		if (isset($this->smarty->registered_cache_resources[$type])) {
			unset($this->smarty->registered_cache_resources[$type]);
		}

		return $this;
	}

	/**
	 * Registers object to be used in templates
	 *
	 * @param string  $object        name of template object
	 * @param object  $object_impl   the referenced PHP object to register
	 * @param array   $allowed       list of allowed methods (empty = all)
	 * @param boolean $smarty_args   smarty argument format, else traditional
	 * @param array   $block_methods list of block-methods
	 * @param array $block_functs list of methods that are block format
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException if any of the methods in $allowed or $block_methods are invalid
	 */
	public function registerObject($object_name, $object_impl, $allowed = array(), $smarty_args = true, $block_methods = array())
	{
		// test if allowed methodes callable
		if (!empty($allowed)) {
			foreach ((array) $allowed as $method) {
				if (!is_callable(array($object_impl, $method))) {
					throw new SmartyException("Undefined method '$method' in registered object");
				}
			}
		}
		// test if block methodes callable
		if (!empty($block_methods)) {
			foreach ((array) $block_methods as $method) {
				if (!is_callable(array($object_impl, $method))) {
					throw new SmartyException("Undefined method '$method' in registered object");
				}
			}
		}
		// register the object
		$this->smarty->registered_objects[$object_name] =
		array($object_impl, (array) $allowed, (boolean) $smarty_args, (array) $block_methods);
		return $this;
	}

	/**
	 * return a reference to a registered object
	 *
	 * @param string $name object name
	 * @return object
	 * @throws SmartyException if no such object is found
	 */
	public function getRegisteredObject($name)
	{
		if (!isset($this->smarty->registered_objects[$name])) {
			throw new SmartyException("'$name' is not a registered object");
		}
		if (!is_object($this->smarty->registered_objects[$name][0])) {
			throw new SmartyException("registered '$name' is not an object");
		}
		return $this->smarty->registered_objects[$name][0];
	}

	/**
	 * unregister an object
	 *
	 * @param string $name object name
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unregisterObject($name)
	{
		if (isset($this->smarty->registered_objects[$name])) {
			unset($this->smarty->registered_objects[$name]);
		}

		return $this;
	}

	/**
	 * Registers static classes to be used in templates
	 *
	 * @param string $class name of template class
	 * @param string $class_impl the referenced PHP class to register
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException if $class_impl does not refer to an existing class
	 */
	public function registerClass($class_name, $class_impl)
	{
		// test if exists
		if (!class_exists($class_impl)) {
			throw new SmartyException("Undefined class '$class_impl' in register template class");
		}
		// register the class
		$this->smarty->registered_classes[$class_name] = $class_impl;
		return $this;
	}

	/**
	 * Registers a default plugin handler
	 *
	 * @param callable $callback class/method name
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException if $callback is not callable
	 */
	public function registerDefaultPluginHandler($callback)
	{
		if (is_callable($callback)) {
			$this->smarty->default_plugin_handler_func = $callback;
		} else {
			throw new SmartyException("Default plugin handler '$callback' not callable");
		}

		return $this;
	}

	/**
	 * Registers a default template handler
	 *
	 * @param callable $callback class/method name
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException if $callback is not callable
	 */
	public function registerDefaultTemplateHandler($callback)
	{
		if (is_callable($callback)) {
			$this->smarty->default_template_handler_func = $callback;
		} else {
			throw new SmartyException("Default template handler '$callback' not callable");
		}

		return $this;
	}

	/**
	 * Registers a default template handler
	 *
	 * @param callable $callback class/method name
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException if $callback is not callable
	 */
	public function registerDefaultConfigHandler($callback)
	{
		if (is_callable($callback)) {
			$this->smarty->default_config_handler_func = $callback;
		} else {
			throw new SmartyException("Default config handler '$callback' not callable");
		}

		return $this;
	}

	/**
	 * Registers a filter function
	 *
	 * @param string $type filter type
	 * @param callback $callback
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function registerFilter($type, $callback)
	{
		$this->smarty->registered_filters[$type][$this->_get_filter_name($callback)] = $callback;
		return $this;
	}

	/**
	 * Unregisters a filter function
	 *
	 * @param string $type filter type
	 * @param callback $callback
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unregisterFilter($type, $callback)
	{
		$name = $this->_get_filter_name($callback);
		if (isset($this->smarty->registered_filters[$type][$name])) {
			unset($this->smarty->registered_filters[$type][$name]);
		}

		return $this;
	}

	/**
	 * Return internal filter name
	 *
	 * @param callback $function_name
	 * @return string internal filter name
	 */
	public function _get_filter_name($function_name)
	{
		if (is_array($function_name)) {
			$_class_name = (is_object($function_name[0]) ?
			get_class($function_name[0]) : $function_name[0]);
			return $_class_name . '_' . $function_name[1];
		} else {
			return $function_name;
		}
	}

	/**
	 * load a filter of specified type and name
	 *
	 * @param string $type filter type
	 * @param string $name filter name
	 * @throws SmartyException if filter could not be loaded
	 */
	public function loadFilter($type, $name)
	{
		$_plugin = "smarty_{$type}filter_{$name}";
		$_filter_name = $_plugin;
		if ($this->smarty->loadPlugin($_plugin)) {
			if (class_exists($_plugin, false)) {
				$_plugin = array($_plugin, 'execute');
			}
			if (is_callable($_plugin)) {
				$this->smarty->registered_filters[$type][$_filter_name] = $_plugin;
				return true;
			}
		}
		throw new SmartyException("{$type}filter \"{$name}\" not callable");
	}

	/**
	 * unload a filter of specified type and name
	 *
	 * @param string $type filter type
	 * @param string $name filter name
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unloadFilter($type, $name)
	{
		$_filter_name = "smarty_{$type}filter_{$name}";
		if (isset($this->smarty->registered_filters[$type][$_filter_name])) {
			unset ($this->smarty->registered_filters[$type][$_filter_name]);
		}

		return $this;
	}

	/**
	 * preg_replace callback to convert camelcase getter/setter to underscore property names
	 *
	 * @param string $match match string
	 * @return string replacemant
	 */
	private function replaceCamelcase($match) {
		return "_" . strtolower($match[1]);
	}

	/**
	 * Handle unknown class methods
	 *
	 * @param string $name unknown method-name
	 * @param array  $args argument array
	 */
	public function __call($name, $args)
	{
		static $_prefixes = array('set' => true, 'get' => true);
		static $_resolved_property_name = array();
		static $_resolved_property_source = array();

		// method of Smarty object?
		if (method_exists($this->smarty, $name)) {
			return call_user_func_array(array($this->smarty, $name), $args);
		}
		// see if this is a set/get for a property
		$first3 = strtolower(substr($name, 0, 3));
		if (isset($_prefixes[$first3]) && isset($name[3]) && $name[3] !== '_') {
			if (isset($_resolved_property_name[$name])) {
				$property_name = $_resolved_property_name[$name];
			} else {
				// try to keep case correct for future PHP 6.0 case-sensitive class methods
				// lcfirst() not available < PHP 5.3.0, so improvise
				$property_name = strtolower(substr($name, 3, 1)) . substr($name, 4);
				// convert camel case to underscored name
				$property_name = preg_replace_callback('/([A-Z])/', array($this,'replaceCamelcase'), $property_name);
				$_resolved_property_name[$name] = $property_name;
			}
			if (isset($_resolved_property_source[$property_name])) {
				$_is_this = $_resolved_property_source[$property_name];
			} else {
				$_is_this = null;
				if (property_exists($this, $property_name)) {
					$_is_this = true;
				} else if (property_exists($this->smarty, $property_name)) {
					$_is_this = false;
				}
				$_resolved_property_source[$property_name] = $_is_this;
			}
			if ($_is_this) {
				if ($first3 == 'get')
				return $this->$property_name;
				else
				return $this->$property_name = $args[0];
			} else if ($_is_this === false) {
				if ($first3 == 'get')
				return $this->smarty->$property_name;
				else
				return $this->smarty->$property_name = $args[0];
			} else {
				throw new SmartyException("property '$property_name' does not exist.");
				return false;
			}
		}
		if ($name == 'Smarty') {
			throw new SmartyException("PHP5 requires you to call __construct() instead of Smarty()");
		}
		// must be unknown
		throw new SmartyException("Call of unknown method '$name'.");
	}

}

?>